I''s was my first romance manga and I loved it! I remember reading the preview of it in the monthly Shounen Jump years ago. GE: Good Ending was another great one along with Suzuka and Ichigo 100%. I'm currently reading Kimi no Iru Machi.

Cheese in the Trap currently is very interesting. I normally wouldn't support such a manipulative romance but the protagonist is perceptive and intelligent enough to possibly create a sense of equality in the relationship so I'll ride this burning ship as long as I can.

I like Horimiya for when I just want warmth and no overdone tragedies or drama.

Hirunaka no Ryuusei has gorgeous art but the cliches and air-headed protag just piss me off. It's still a step above the generic shoujo.

Koi Dano Ai Dano is a romance but the romance is mostly one-sided and insignificant for now. It has a lot more to do with analysis on high school behaviors and the main female lead is the driving force and intellectual of the story so somewhat refreshing.

Gakuen Alice was really cute (too bad it ended )
and i also like stuff like The World God Only Knows
but my all time favourites are going to be Watashi ni xx Shinasai and Koko ni Iru Yo (both by the same mangaka!)

Completed:
1) Magico (MUST READ FOR MOAR HAPPYNEZZZ IN YER SOUL)
2) Hadashi De bara wo fume - Solid
3) Kaichou Wa Maid Sama - Endings good but not great
4) Deadman Wonderland/Mirai Nikki somewhat fall into this category
5) SAO - Felt like this manga/anime had one of the best progressive romances with the proper amount of affection and PDA that left me satisfied for more of the luv feelz. Marriage, kid, cabin to enjoy each other in...the best!